U.S. Steel Tower, also known as the Steel Building (formerly USX Tower) is a 64-story, skyscraper with of leasable space at 600 Grant Street in downtown Pittsburgh, Pennsylvania. It is the tallest skyscraper in Pittsburgh, the fourth tallest building in Pennsylvania, and the 41st tallest in the United States.The tower's original name when completed in 1970 was the U.S. Steel Building and was...